为了提高螺旋波带片用于相衬成像的分辨率和成像对比度，因此本文将螺旋波带片的透光环带替换为透光微孔，以类-贝塞尔函数作为螺旋光子筛透过率的振幅调制窗函数设计了一种螺旋光子筛.在相同的特征尺寸下，螺旋光子筛比螺旋波带片具有更大的数值孔径，因此分辨率更高.同时基于光瞳切趾原理，经过类-贝塞尔振幅调制窗函数对螺旋光子筛透光微孔的分布进行调制，螺旋光子筛的成像对比度将高于螺旋波带片.通过数值计算和仿真分析表明：螺旋光子筛的点扩展函数主瓣宽度相对于螺旋波带片更窄，旁瓣幅值也相对更低.在相衬成像中，螺旋光子筛不仅能够消除螺旋波带片对圆盘状位相物体成像时图像的“浮雕”效应而且能够更为清晰地分辨出位相跳变更为密集的周期矩形条状物体.因此，螺旋光子筛用于相衬成像中将具有更高的成像分辨率和成像对比度，其在医学领域将具有广阔的运用前景.

In order to improve the imaging resolution and image contrast, the method proposed in this paper to achieve phase-contrast imaging with a spiral photon sieves.The transmission zone of the spiral zone plate is replaced appropriately by a large number of pinholes, with Bessel-like function as the spiral photon sieves apodization window.The same minimum features sizes, the numerical aperture of spiral photon sieves is increased compared to spiral zone plate, so spiral photon sieves show substantially better spatial resolution the spiral zone plate according to the Rayleigh resolution criterion.The advantage of spiral photon sieves is that can modulate the population of the pinholes per zone with an apodization window, resulting in high signal-to-noise ratio or extremely low side lobe. So the spiral photon sieves have a high imaging contrast based on the principle of pupil apodization. Compared with the spiral zone plate, the point spread function of the spiral photon sieve the main lobe width is relatively narrow and the side lobe amplitude is relatively lower. In phase-contrast imaging, spiral photon sieve can not only eliminate image “relief” effect in the circular phase object imaging but also can distinguish dense phase jump in the periodic rectangular strip phase object imaging, improving greatly the image contrast. Therefore, the spiral photon sieves has higher resolution and contrast in phase-contrast imaging, so that it will have broad application prospects in the field of medicine.